histog[((rowb[i] & 0xFF) - ((rowbprev[i] & 0xFF)) / 2) & 0xFF]++;
for (j = 1, i = iminfo.bytesPixel + 1; i <= imax; i++, j++)
histog[((rowb[i] & 0xFF) - ((rowbprev[i] & 0xFF) + (rowb[j] & 0xFF)) / 2) & 0xFF]++;
break;
default:
throw new PngjExceptionInternal("Bad filter:" + filterType);
}
}